Manual

8. By cycling constantly, the Cell Controller repeats the process for every

tag within reach of its antennas.

The 3D-iD tags are designed using L

RF technology. They are designed for

Long range, Long battery life and Low cost. In an open environment, a tag can

be seen at more than 100 feet. This is a far greater distance than traditional

RFID tracking technologies can offer. In addition, a tags battery typically lasts

over 1 year. With some configurations, a tags battery can last over 5 years.

What defines the tag as an L

RF device? The technology is proprietary, howev-

er, there are some interesting technologies involved.

Spread Spectrum Technology:

First and foremost, the system uses direct sequence spread spectrum technolo-

gy. Spread spectrum is used because the technology allows for clear transmis-

sion over long distances with little signal strength. In addition, spread spectrum

technology allows for the operation of many devices within a single frequency

range. This removes the impractical requirement that a frequency be set aside

soley for use of the 3D-iD system. Direct Sequence spread spectrum is used

because alternatives, such as frequency hopping spread spectrum, require sig-

nificantly more complex hardware and far greater system synchronization. This

hardware would complicate Tag, Antenna and Cell Controller design, raise main-

tenance costs, increase Tag weight and significantly increase the initial costs of

the system. For more details, see the www.pinpointco.com

Dual Frequency Technology:

The 3D-iD system also relies on a unique dual frequency architecture. The

Antennas send signals to the Tags at 2.442GHz. The Tags respond with a

5.770GHz signal. The dual frequency approach is used to remove the complex-

ities of separating modulated Tag responses from unmodulated radio reflections

when both lie within a single frequency. Take as an example a signal that is

broadcast by an antenna at one frequency when the antenna is listening at that

same frequency. Metal walls and other objects might bounce back a false

return signal that would be difficult to distinguish from a geniune Tag return sig-

nal. If the tag responds at another frequency, in this case, at 5.770GHz, its sig-

nal need only be separated from the surrounding noise - not from very similar

versions of itself.